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Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  | $ 75,074 | $ 75,153 | $ 80,226 | $ 79,593 | $ 75,153 | $ 79,593
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  | 6 |  | (6) |  | 12 | (7)
Other comprehensive income (loss) |  | (155) | (74) | (2,015) | 1,007 | (229) | (1,008)
Ending Balance |  | 26,143 | 75,074 | 77,703 | 80,226 | 26,143 | 77,703
Pension Plan |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  |  | (620) |  | 95 | (620) | 95
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  |  |  | 6 | 10
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  | 2 | (2)
Other comprehensive income (loss) |  |  |  |  |  | 8 | 8
Ending Balance |  | (511) |  | 103 |  | (511) | 103
Other Benefit Plans |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  |  | 79 |  | (53) | 79 | (53)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  |  |  | (85) | 0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  | (1) | 0
Other comprehensive income (loss) |  |  |  |  |  | (86) | 0
Ending Balance |  | (7) |  | (53) |  | (7) | (53)
Cumulative Translation Adjustment |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  |  | (2,793) |  | (1,217) | (2,793) | (1,217)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | [1] |  |  |  |  | (174) | (1,011)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  | 0 | 0
Other comprehensive income (loss) |  |  |  |  |  | (174) | (1,011)
Ending Balance |  | (1,854) |  | (2,228) |  | (1,854) | (2,228)
Derivative Instruments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  |  | (26) |  | (2) | (26) | (2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  |  |  | 12 | 0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  | 11 | (5)
Other comprehensive income (loss) |  |  |  |  |  | 23 | (5)
Ending Balance |  | (3) |  | (7) |  | (3) | (7)
Total |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning Balance |  | (3,434) | (3,360) | (170) | (1,177) | (3,360) | (1,177)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  |  |  | (241) | (1,001)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  | 12 | (7)
Other comprehensive income (loss) |  | (155) | (74) | (2,015) | 1,007 | (229) | (1,008)
Ending Balance |  | $ (2,375) | $ (3,434) | $ (2,185) | $ (170) | (2,375) | $ (2,185)
Internal Reorganization [Member] | Other Benefit Plans |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  | 0 |
Internal Reorganization [Member] | Cumulative Translation Adjustment |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  | 1,113 |
Internal Reorganization [Member] | Comprehensive Income [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  | 1,214 |
Internal Reorganization [Member] | Derivative [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  | 0 |
Internal Reorganization [Member] | Pension Plan |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income, Other, Net of Tax |  |  |  |  |  | $ 101 |
[1] | The cumulative translation adjustment loss for the six months ended June 30, 2018 was primarily driven by the strengthening of the U.S. Dollar ("USD") against the European Euro ("EUR") and the Brazilian Real ("BRL"). The cumulative translation adjustment gain for the six months ended June 30, 2019 was primarily driven by the weakening of the European Euro (“EUR”) against the USD.

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